SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
A High-Resolution PWM (HRPWM) modulator is added to the ePWM module in each of the device PWMSS subsystems, hence the device ePWMs are signified as eHRPWMs.
The HR PWM option applies only to the ePWMxA output channel of the PWMSSn (ehre n=1 to 3 for the device). The PWMSSn ePWMxB channel has conventional capabilities. For more details on HRPWM features of ePWM modules refer to the Section 31.2.45.
While the eCAP functionalities are fully implemented in the device, the eHRPWM and eQEP module interface have some restrictions in functionality. The eHRPWM and eQEP restrictions which are common between the PWMSS1, PWMSS2 and PWMSS3 subsystems are, as follows:
The eHRPWM and eQEP functional interface signals which are NOT available to user for the PWMSS1, PWMSS2 and PWMSS3 are summarized in Table 31-6.
Module Interface | Signal | Description | Comment |
---|---|---|---|
PWMSSn eHRPWM (where n= 1 to 3) | EPWM_COMP_EPWMDCMAH | ePWM Comparator A input (HIGH) | Not available at chip boundary (can not be used) |
EPWM_COMP_EPWMDCMAL | ePWM Comparator A input (LOW) | ||
EPWM_COMP_EPWMDCMBH | ePWM Comparator B input (HIGH) | ||
EPWM_COMP_EPWMDCMBL | ePWM Comparator B input (LOW) | ||
EPWM_EPWMA_i | ePWM A input | ||
EPWM_EPWMB_i | ePWM B input | ||
EPWM_TRIP_TZ[5:1] | ePWM Tripzone inputs [5:1] | ||
EPWM_ADC_SOCA | ePWM Start of ADC conversion A output | ||
EPWM_ADC_SOCB | ePWM Start of ADC conversion B output | ||
EPWM_TRIP_TZ_O[5:0] | ePWM Tripzone outputs | ||
PWMSSn eQEP (where n= 1 to 3) | EQEP_ERR_PHASE_ERR | eQEP phase error output | Not available at chip boundary (can not be used) |
EQEP_EQEPA_O | eQEP quadrature A output | ||
EQEP_EQEPB_O | eQEP quadrature B output |
Only for the device eHRPWM1 module, the SYNCI input and SYNCO output signals are available at chip-level – these are the signals ehrpwm1_synci and ehrpwm1_synco, respectively. The eHRPWM2 and eHRPWM3 SYNCi and SYNCO signals are not available on device pads. For more information, see section, PWMSS Environment.